update actions to v4

Author: stes

.github/workflows/build.yml

@@ -35,7 +35,7 @@ jobs:
     steps:
       - name: Cache dependencies
         id: pip-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cache/pip
           key: pip-os_${{ runner.os }}-python_${{ matrix.python-version }}-torch_${{ matrix.torch-version }}-sklearn_${{ matrix.sklearn-version }}

.github/workflows/doc-coverage.yml

@@ -31,7 +31,7 @@ jobs:
     #  with:
     #    ref: main
     - uses: actions/checkout@v3
-    - uses: actions/cache@v1
+    - uses: actions/cache@v4
       with:
         path: ~/.cache/pip
         key: ${{ runner.os }}-pip

.github/workflows/docs.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
       - name: Cache dependencies
         id: pip-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip

.github/workflows/release-pypi.yml

@@ -23,7 +23,7 @@ jobs:
     steps:
       - name: Cache dependencies
         id: pip-cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-pip